Why are these parked asymmetrically? And how can a plane owner get to their plane if it's on the farthest end?
Image Source: Wikimedia Commons
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If your photo had only one aircraft pinned behind or between two others, there would be another possibility: it's a repair shop, and the owner of the pinned aircraft hasn't paid their bill.
I've known repair shops which, in order to prevent sketchy or troublesome clients from simply taking their repaired airplane and flying away, trap it behind other aircraft (or in one case between two large trucks parked inches from the nose and tail!).
Certainly this is not the case in your specific image, but sometimes the answer to "how can an owner get to their plane if it's on the far end" is "they can't, on purpose".
This is what happens when there are more planes to park than can fit on the apron. They are parked asymmetrically to fit as many aircraft as possible into the smallest area.
Airports have various procedures for parking depending on how long the aircraft are expected to be on the ground and the overall anticipated demand for parking space. At peak times of the year you have to book a parking spot at your destination. And as @Digital Dracula said, sometimes you have to go to another airport to park when there is not enough space left.
In situations like this you can't just jump in your plane and fly away. It involves working with the airport to move your plane out of the jigsaw. This can take a few hours when the airport is very full, and is done very carefully by all involved.
They shuffle each aircraft out of the way sometimes moving the aircraft multiple time to replace the hole that yours has just made. The airports plan these movements ahead and place the planes in the expected departure order to minimize moves.
It is very fortunate that you properly cited your image. This makes it so that there is no need for speculation here. When you follow the citation train it brings you back to https://www.airliners.net/photo/Gulfstream-Aerospace-G-IV/2393432/L
The photo's caption reads:
The ramp at St.Maarten gets very full around New Year, making it necessary for many business jets to fly over to Anguilla to re-park.
and if you follow the comments, an anonymous user who seems to be an authority on what happened here states:
The aircraft are parked according to departures after a while. At night when the aerodrome is closed, crews reposition aircraft and place them in order of departures. A tug is at the ready during operations and shifts them accordingly. They do it each year. Anguilla now has some additional parking, so I doubt it will look like this December 2014
So, in this exact case, they parked them asymmetrically because they can fit more planes in the space this way, but they did it in an "orderly" fashion such that they are organized left to right by departure time.
This is a partial answer. Wait for more complete ones.
Regarding how the owners can get their aircraft, I confess my ignorance. A speculative answer could be, they are parked in order of anticipated departure – if plane A is expected to depart first, it's parked at the front.
To the question, Why are they parked asymmetrically, the answer is: Because this maximizes the number of aircraft that can fit on a given area.
Details regarding the situation from the image info:
Aircraft parking at Anguilla Airport. The ramp at St.Maarten gets very full around New Year, making it necessary for many business jets to fly over to Anguilla to re-park